FreePDF: The Highlight changes function is not available in FreePDF.
Text that was edited in the PDF file can be highlighted in color.
Proceed as follows:
| 1. | Choose the command File | Options. |
| 2. | Switch to the Editing tab. |
| 3. | Make sure that Show changed text in is selected and select a color from the dropdown list. |
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Tip: You can also enable or disable the option Show changed text directly on the ribbon tab Review | group Track changes.